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Carl Sagan showing how it was determined the Earth was not flat thousands of years ago...

Carl Sagan Globular Earth Deduced by Eratosthenes...

Stashed in: Best Videos, Carl Sagan, Carl Sagan, Mix Mux

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Top Reddit comment:

Eratosthenes only tools were sticks, eyes, feet, and brains.

B.o.B is clearly missing a tool.

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